Halo Fountain, Phyrexian Altar, and March of the Machines

Prerequisites

• Halo Fountain on the battlefield
• Phyrexian Altar on the battlefield
• March of the Machines on the battlefield
• available

Steps

1. Activate Halo Fountain's first ability by paying , tapping it and untapping it, creating a 1/1 Citizen creature token
2. Activate Phyrexian Altar by sacrificing the Citizen, adding
3. Repeat

Results

• Infinite death triggers
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers